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Ring network security system with encoding of data entering a subnetwork and decoding of data leaving a subnetwork

  • US 5,495,580 A
  • Filed: 10/20/1992
  • Issued: 02/27/1996
  • Est. Priority Date: 10/20/1992
  • Status: Expired due to Term
First Claim
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1. A network security system for use in a ring network having at least one node on a subnetwork, including:

  • (a) encoding means, coupled between the ring network and the subnetwork, for receiving data from the ring network and determining if the received data is not intended to be received by a node within the subnetwork, encoding at least part of the data if so determined, and transmitting the resulting received data over the subnetwork to the at least one node;

    (b) decoding means, coupled between the ring network and the subnetwork, for receiving data from the at least one node, at least some of which was previously transmitted by the encoding means to the subnetwork, determining if such received data was previously encoded by the encoding means, and decoding the received data if so determined.

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